package servlet;

import com.fasterxml.jackson.databind.ObjectMapper;
import model.Blog;
import model.BlogDao;
import model.User;
import model.UserDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author: 杰
 * @date: 2024/1/18 20:10
 */
@WebServlet("/getAuthorInfo")
public class AuthorInfoServlet extends HttpServlet {
    private ObjectMapper objectMapper = new ObjectMapper();
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.先拿到请求中的blogId
        String blogId = req.getParameter("blogId");
        if (blogId == null) {
            resp.setContentType("text/html; charset=utf8");
            resp.getWriter().write("请求中缺少 blogId！");
            return;
        }
        //2.在blog表中查询到对应的blog对象
        BlogDao blogDao = new BlogDao();
        Blog blog = blogDao.getBlog(Integer.parseInt(blogId));
        if (blog == null) {
            resp.setContentType("text/html; charset=utf8");
            resp.getWriter().write("blog没有找到！");
            return;
        }
        UserDao userDao = new UserDao();
        User user = userDao.getUserById(blog.getUserId());
        resp.setContentType("application/json; charset=utf8");
        String respJson = objectMapper.writeValueAsString(user);
        resp.getWriter().write(respJson);
    }
}
